Electroconvulsive therapy (ECT) is delivered by psychiatrists, not psychologists. It is a well-established treatment for major depressive disorder, but exactly how it changes the brain has been unclear. A 2024 study scanned the brains of 80 people with major depression, including 50 who had suicidal thoughts, before and after ECT, and compared the results with those of 37 healthy volunteers.
Before treatment, patients' brain networks were less organised into distinct working regions and shifted more unpredictably between activity patterns than those of the healthy volunteers. After ECT, this settled. Brain activity became more organised and less erratic, particularly in networks involved in self-referential thinking and bodily sensation. In patients who had suicidal thoughts, ECT was linked to steadier activity in a specific frontal brain region, and how unstable their brain networks were before treatment predicted how much they improved. That link did not hold for patients without suicidal thoughts.
This adds to our understanding of what ECT actually does in the brain, and points toward ways doctors might eventually predict who will benefit most. If severe depression, with or without suicidal thoughts, is affecting you or someone you know, reaching out to a GP or mental health professional is a good first step.